L. S. Gee

Frequency‐Dependent Seismic Attenuation within the Hispaniola Island Region of the Caribbean Sea

Wedetermine frequency-dependentattenuation1=Qffor theHispanio- la region using direct S and Lg waves over five distinct passbands from 0.5 to 16 Hz. Data consist of 832 high-quality vertical and horizontal component waveforms recordedonshort-period andbroadbandseismometersfromthedevastating12January 2010 M 7.0 Haiti earthquake and the rich sequence of aftershocks. For the distance range 250-700 km, we estimate an average frequency-dependent Qf �� 224�� 27� f 0:64�� 0:073� using horizontal components of motion and note that Qf� estimated with Lg at regional distances is very consistent across vertical and horizontal components. We also determine a Qf �� 142�� 21� f 0:71�� 0:11� for direct S waves at local distances, ≤100 km. The strong attenuation observed on both vertical and horizontal components of motion is consistent with expectations for a tectonically active region. Online Material: Figures of filtered and broadband data, Lg- and S-wave ampli- tudes, and apparent frequency-dependent Q, and tables of earthquake and station parameters.

Broadband Seismic Noise Attenuation versus Depth at the Albuquerque Seismological Laboratory

Abstract Seismic noise induced by atmospheric processes such as wind and pressure changes can be a major contributor to the background noise observed in many seismograph stations, especially those installed at or near the surface. Cultural noise such as vehicle traffic or nearby buildings with air handling equipment also contributes to seismic background noise. Such noise sources fundamentally limit our ability to resolve earthquake‐generated signals. Many previous seismic noise versus depth studies focused separately on either high‐frequency (>1  Hz) or low‐frequency (

Frequency‐Dependent Seismic Attenuation within the Hispaniola Island Region of the Caribbean SeaFrequency‐Dependent Seismic Attenuation within the Hispaniola Island Region of the Caribbean Sea

Wedetermine frequency-dependentattenuation1=Qffor theHispanio- la region using direct S and Lg waves over five distinct passbands from 0.5 to 16 Hz. Data consist of 832 high-quality vertical and horizontal component waveforms recordedonshort-period andbroadbandseismometersfromthedevastating12January 2010 M 7.0 Haiti earthquake and the rich sequence of aftershocks. For the distance range 250-700 km, we estimate an average frequency-dependent Qf �� 224�� 27� f 0:64�� 0:073� using horizontal components of motion and note that Qf� estimated with Lg at regional distances is very consistent across vertical and horizontal components. We also determine a Qf �� 142�� 21� f 0:71�� 0:11� for direct S waves at local distances, ≤100 km. The strong attenuation observed on both vertical and horizontal components of motion is consistent with expectations for a tectonically active region. Online Material: Figures of filtered and broadband data, Lg- and S-wave ampli- tudes, and apparent frequency-dependent Q, and tables of earthquake and station parameters.